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Those spiders are supposed to be 42g. You can't get much lighter than that. I'm not aware of any lighter versions of that spider, and that's probably because it's tough to make it any lighter! You might be able to cut 5g off, but it really isn't worth trying. I wouldn't recommend drillium. Cannondale already has things optimized, so any additional holes could jeopardize the life of the part. Having a spider break in the middle of a high-watt effort is not something that you want to experience.

get a power meter that replace those spiders.Power2Max (or Quarq) spiders are around 150g so you add about 104 grams to get both legs power measured accurately which might worth it compare to Stages that add 20g to left side crank arm and measure only one side.